If the box is moving at constant velocity, net force must be zero, so:
F + fr = 0
fr = -F
<u>fr = -40 N</u>
 
        
                    
             
        
        
        
Answer:
Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.
Explanation:
 
        
             
        
        
        
Geologists do not use a minerals color or streak to identify them because some minerals can have the same streak and color but the correct answer is 
b) color
        
             
        
        
        
Answer: A wave with a frequency of 14 Hz has a wavelength of 3 meters. At what speed will this wave travel? 1. = 3m (4. = 42m. 2. ... 1,7m (46) = 7802 m. 4. A wave traveling at 230 m/sec has a wavelength of 2.1 meters. What is the frequency of.
Explanation: please give me brainlest
 
        
             
        
        
        
Answer:
♕ 
☃ 
- Frequency ( f ) = 7 Hertz
- Wavelength ( λ ) = 42m
♨ 
☄ 
✧ 
~Plug the known values and then multiply!
↦ 
↦ 
☥ 
---------------------------------------------------------------
❁ 
- Frequency ( f ) : The number of complete waves , set up in a medium in one second is called frequency of the wave. The SI unit of frequency is Hertz ( Hz ). For example : if a sound wave completes 15 compressions and 15 rarefactions in one second , it's frequency is 15 Hz.
- Wavelength ( λ ) : The distance between two consecutive troughs or crests in a transverse wave or the distance between two consecutive compressions or rarefactions in a longitudinal wave us called wavelength. It is the distance travelled by a wave in a time equal to it's time period. It's SI unit is metre ( m ).
- Wave velocity ( v ) : The velocity with which a wave propagates in a medium is called wave velocity. It's SI unit is m/s.
# KILL : Excuses 
 KISS : Opportunities 
 MARRY : Goals 
♪ Hope I helped! ♡
☂ Have a wonderful day / night ! ツ
✎  ✔
 ✔
▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁